Vehicle Wiper System External Pivot Mounting
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Solution Overview
Problem
Traditional wiper systems, including extended designs, occupy excessive space inside vehicles and fail to effectively cover a larger area for improved visibility, leading to mutual interference issues in butterfly wiper configurations and insufficient coverage in tandem wipers.
Innovation Solution
A compact wiper system design featuring first and second wiper arms, a reciprocally pivoted motor, crank, and link rods with pivot shaft assemblies, where the second pivot shafts are fixed relative to the vehicle body, and wiper arms are mounted externally to avoid internal space occupation, allowing for extended reach and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the second pivot shaft is not fixed relative to the vehicle body and swings with the movement of the second link rod, then the movement range of the wiper system is extended, but the space occupied inside the vehicle increases
Solution Approach 1:
The patent relocates the wiper arm assembly from the interior space to the exterior of the vehicle body, utilizing the external dimensional space. The second pivot shaft assembly and wiper arm are mounted on the outer surface of the vehicle body, allowing the wiper system to achieve extended movement range without consuming internal vehicle space. This dimensional relocation resolves the contradiction between expanding scraping area and minimizing internal space occupation.
2Area of moving object
If a butterfly wiper configuration is used to expand the scraping area, then the field of view is improved, but mutual interference between wiper blades occurs
Solution Approach 1:
The patent divides the wiper system into two independent pivot shaft assemblies (first and second pivot shaft assemblies), each capable of independent reciprocating motion. This segmentation allows the wiper blades to operate independently without mutual interference, while still achieving expanded scraping coverage through the coordinated action of both assemblies. The independent operation eliminates the interference problem inherent in traditional butterfly wiper configurations.
3Ease of operation
If a tandem wiper is used to scrape rain or snow, then the basic wiper function is provided, but the scraping area is insufficient for better field of view
Solution Approach 1:
The patent creates a multi-functional wiper system where the first wiper arm assembly handles the primary scraping function, while the second wiper arm assembly extends the scraping coverage to additional areas. Both assemblies share the same motor and crank mechanism, allowing the system to perform multiple scraping functions simultaneously. This multi-functionality design expands the total scraping area while maintaining the reliability of the basic wiper operation.
Data Source
Figure 1
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Figure 4~6
AI summary
A wiper system for a vehicle comprises: a first and a second wiper arms (15, 17), a motor (11), a crank (12) connected an output shaft of the motor (11), a first and a second link rods (6, 7) pivotably connected to the crank (12), a first pivot shaft assembly driven by the first link rod (6) and a second pivot shaft assembly driven by the second link rod (7), wherein the second pivot shaft assembly comprises: a second and a third pivot shafts (2, 3), a first link rod (16), a second wiper arm (17), and a third link rod (18). By means of the wiper system, the wiping area can be increased and the space inside the vehicle occupied by the wiper assembly can be reduced.